US20220379337A1 - Coating device, coating film, and coating method - Google Patents

Coating device, coating film, and coating method Download PDF

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Publication number
US20220379337A1
US20220379337A1 US17/638,855 US202017638855A US2022379337A1 US 20220379337 A1 US20220379337 A1 US 20220379337A1 US 202017638855 A US202017638855 A US 202017638855A US 2022379337 A1 US2022379337 A1 US 2022379337A1
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United States
Prior art keywords
coating
head
discharge
region
end portion
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Abandoned
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US17/638,855
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English (en)
Inventor
Daisuke Hozumi
Ayumu Matsumoto
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Kyocera Corp
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Kyocera Corp
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Assigned to KYOCERA CORPORATION reassignment KYOCERA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOZUMI, DAISUKE, MATSUMOTO, AYUMU
Publication of US20220379337A1 publication Critical patent/US20220379337A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0208—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work for applying liquid or other fluent material to separate articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
    • B05B12/04—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for sequential operation or multiple outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0431—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with spray heads moved by robots or articulated arms, e.g. for applying liquid or other fluent material to 3D-surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1015—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target
    • B05C11/1021—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to a conditions of ambient medium or target, e.g. humidity, temperature ; responsive to position or movement of the coating head relative to the target responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects

Definitions

  • Disclosed embodiments relate to a coating device, a coating film, and a coating method.
  • a coating device using an inkjet method is known.
  • a head for discharging a coating material is mounted on such a coating device of an inkjet method.
  • a coating device coats a coating region of a to-be-coated object having a convex curved surface.
  • a coating device includes a head, an arm, and a controller.
  • the head includes a nozzle surface.
  • the arm holds the head.
  • the controller controls movement of the head via the arm.
  • the controller moves the head in a first direction along an end portion of the coating region in a posture in which a gap between the nozzle surface located on the end portion side of the coating region and the to-be-coated object is smaller than a gap between the nozzle surface located on a center side of the coating region and the to-be-coated object.
  • FIG. 1 is an explanatory view of a coating device according to an embodiment.
  • FIG. 2 is a cross-sectional view illustrating an example of a to-be-coated object that was coated.
  • FIG. 3 is an explanatory view illustrating an example of an arrangement of a head included in a coating device according to a first embodiment.
  • FIG. 4 is an explanatory view illustrating an example of discharge drops discharged from a coating device according to a second embodiment.
  • FIG. 5 A is an explanatory view comparing discharging techniques of a coating material.
  • FIG. 5 B is an explanatory view comparing discharging techniques of a coating material.
  • FIG. 6 is an explanatory view illustrating an example of discharge drops discharged from a coating device according to a third embodiment.
  • FIG. 7 is a partial enlarged view of FIG. 6 .
  • FIG. 8 is an explanatory view illustrating an example of discharge drops discharged from a coating device according to a fourth embodiment.
  • FIG. 9 is a cross-sectional view illustrating an example of a coated body according to an embodiment.
  • FIG. 10 is a view illustrating an example of a head according to a variation of the embodiments.
  • FIG. 1 is an explanatory view of the coating device according to the embodiment.
  • FIG. 1 illustrates a three dimensional orthogonal coordinate system including a Z-axis including a vertically upward direction serving as a positive direction and a vertically downward direction serving as a negative direction.
  • Such an orthogonal coordinate system may also be illustrated in other drawings used in the description below.
  • the same components as those of the coating device 1 illustrated in FIG. 1 are denoted by the same reference numerals, and descriptions thereof will be omitted or simplified.
  • a coating device 1 includes a head 10 , a robot 20 , and a control device 40 .
  • the head 10 is fixed to the robot 20 .
  • the head 10 moves in response to movement of the robot 20 controlled by the control device 40 .
  • the head 10 can use, for example, an inkjet head of a valve type, a piezo type, or a thermal type. When a piezo type or thermal type inkjet head is used as the head 10 , high resolution is easily realized.
  • the head 10 coats a to-be-coated object 30 by depositing a coating material discharged from a plurality of discharge holes 11 located on a nozzle surface 12 onto a surface of the to-be-coated object 30 facing the nozzle surface 12 .
  • the coating material is supplied to the head 10 from a tank (not illustrated).
  • the head 10 discharges the coating material supplied from the tank.
  • the coating material is a mixture containing a volatile component and a nonvolatile component, and has fluidity.
  • the tank may be a reservoir (not illustrated) housed in the head 10 .
  • the volatile component is, for example, water, organic solvent, or alcohol, and adjusts the physical properties such as viscosity and surface tension of the coating material.
  • the nonvolatile component contains, for example, a pigment, a resin material, and an additive.
  • the pigment includes one or more colored pigments used depending on a desired coating color.
  • the resin material is deposited on the to-be-coated object 30 and forms a film.
  • the additive is a functional material that is added, for example for purposes of weather resistance and the like.
  • the coating material supplied to the discharge holes 11 is prepared such that a desired coating color is expressed by mixing a plurality of colored pigments or coating materials at predetermined proportions.
  • the robot 20 holds the head 10 .
  • the robot 20 is, for example, a six-axis articulated robot.
  • the robot 20 may be, for example, a vertical articulated robot or a horizontal articulated robot.
  • the robot 20 includes a plurality of arms 21 with the head 10 fixed to a tip of the plurality of arms 21 .
  • the robot 20 is fixed to a floor, a wall, a ceiling, or the like. Note that as long as the held head 10 can be moved properly, there is no limit to the degree of freedom of the arms 21 included in the robot 20 .
  • the control device 40 controls the coating device 1 .
  • the control device 40 includes a controller 41 configured to control the coating device 1 , and a storage unit 45 .
  • the controller 41 includes a discharge controller 42 and an operation controller 43 .
  • the controller 41 includes a computer or various circuits including, for example, a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a hard desk drive (HDD), and an input/output port.
  • the CPU of such a computer functions as the controller 41 by, for example, reading and executing the program stored in the ROM.
  • the controller 41 may also be configured by hardware such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA).
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the discharge controller 42 controls the head 10 based on configuration information stored in the storage unit 45 , and discharges the coating material from the plurality of discharge holes 11 toward the to-be-coated object 30 .
  • the operation controller 43 controls operations of the plurality of arms 21 based on the configuration information stored in the storage unit 45 , and controls movement of the head 10 via the arms 21 .
  • the distance between the head 10 and the to-be-coated object 30 is maintained at, for example, approximately from 0.5 to 14 mm. Note that the detailed movement of the head 10 including the discharge of the coating material will be described later.
  • the storage unit 45 corresponds to, for example, the ROM and the HDD.
  • the ROM and the HDD can store configuration information for various controls in the control device 40 .
  • the storage unit 45 stores information related to discharge control of the coating material by the head 10 . Further, the storage unit 45 stores information related to the operation control of the plurality of arms 21 .
  • the storage unit 45 may store data input by the user's instruction operation using a terminal apparatus (not illustrated) as instruction data for operating the robot 20 . Further, the controller 41 may also acquire the configuration information via another computer or portable storage medium connected by a wired or wireless network.
  • the to-be-coated object 30 is, for example, a vehicle body.
  • the to-be-coated object 30 is placed on a conveying device (not illustrated), and is carried in and out.
  • the coating device 1 according to an embodiment coats the to-be-coated object 30 in a state where the conveying device is stopped. Note that the coating device 1 may coat the to-be-coated object 30 while the to-be-coated object 30 is being repeatedly conveyed and stopped, or may coat the to-be-coated object 30 while the to-be-coated object 30 is being conveyed.
  • FIG. 2 is a cross-sectional view illustrating an example of a to-be-coated object that was coated.
  • the to-be-coated object 30 illustrated in FIG. 2 includes a base member 31 , a primer layer 32 , and a first coating layer 33 .
  • the base member 31 is, for example, a steel plate processed into a predetermined shape, and is subjected to an electrodeposition process as necessary to impart rust resistance thereto.
  • the primer layer 32 is provided for imparting weather resistance, color development, and peeling resistance, for example.
  • the first coating layer 33 is, for example, a base layer that has smoothness and weather resistance and imparts a desired coating color.
  • a surface of the first coating layer 33 serves as a to-be-coated surface 30 a to be coated by the coating device 1 according to the embodiment.
  • a second coating layer 34 is located on the first coating layer 33 serving as the to-be-coated surface 30 a .
  • the second coating layer 34 is located so as to cover a portion of the first coating layer 33 with a coating material having a coating color different from that of the first coating layer 33 .
  • the to-be-coated object 30 becomes a coated body 38 that is coated in a so-called two tone color in which a region 36 where the second coating layer 34 is located and a region 35 where the first coating layer 33 is exposed without the second coating layer 34 being located are aligned with an end portion 37 of the second coating layer 34 as a boundary.
  • the coating device 1 has been described such that the second coating layer 34 is located on the to-be-coated surface 30 a on the first coating layer 33 , but the present invention is not limited thereto, and the coating device 1 may be applied, for example, when the first coating layer 33 is located on a coated surface 32 a on the primer layer 32 .
  • the coated body 38 is not limited to the example illustrated in FIG. 2 .
  • a coating layer (not illustrated) may be located on the surfaces of the regions 35 and 36 .
  • the second coating layer 34 need not be included, and only the first coating layer 33 may be included, and the second coating layer 34 may be located on the entire surface of the first coating layer 33 .
  • the to-be-coated object 30 or the coated body 38 may further include one or a plurality of layers (not illustrated).
  • FIG. 3 is an explanatory view illustrating an example of an arrangement of a head included in a coating device according to a first embodiment.
  • FIG. 3 corresponds to a cross-sectional view of the head 10 and the to-be-coated object 30 facing the nozzle surface 12 of the head 10 as viewed from a Y-axis negative direction side.
  • a center portion in an X-axis direction of the region 36 has an arch shape with a cross-sectional arc-shape protruding toward a Z-axis positive direction
  • the to-be-coated surface 30 a has a convex curved surface of the to-be-coated object 30 .
  • the to-be-coated object 30 is, for example, a hood, a roof, or a pillar of an exterior of the vehicle body.
  • the to-be-coated object 30 may be, for example, an instrument panel, a glove box, or a center console of an interior of the vehicle body.
  • the coating device 1 according to each embodiment described below has a common configuration, except for the movement of the head 10 .
  • other configurations such as the robot 20 and the control device 40 , except for the head 10 , are omitted from the drawings.
  • the head 10 illustrated in FIG. 3 moves in a Y-axis direction serving as a first direction in a state of facing the to-be-coated object 30 .
  • the head 10 may achieve a surface area coating speed of, for example, 1 m 2 /min or more and 5 m 2 /min or less.
  • the head 10 may be moved in the X-axis direction at a moving speed in the X-axis direction of a predetermined speed of, for example, 1.67 ⁇ 102 mm/s or more and 41.67 ⁇ 102 mm/s or less. Note that, in this example, one head 10 is used, but two or more heads 10 may be used.
  • the resolution of the head 10 can be, for example, 150 dots per inch (dpi) or more. More preferably, the resolution of the head 10 is 300 dpi or more. When the resolution of the head 10 is 150 dpi or more, the leveling property is improved and the quality of the coating film is improved. Note that the resolution of the head 10 need not necessarily be 150 dpi or more.
  • the head 10 faces the to-be-coated surface 30 a in an inclined posture so that a gap d 1 between the nozzle surface 12 located on the end portion region 37 a sides and the to-be-coated object 30 is smaller than a gap d 2 between the nozzle surface 12 located on the center side of the region 36 and the to-be-coated object 30 .
  • the coating quality can be improved.
  • the gap d 1 can be, for example, approximately from 0.5 to 14 mm.
  • the gap d 2 can be, for example, approximately from 2.0 to 30 mm.
  • the gaps d 1 and d 2 can be changed in accordance with the size of the head 10 and the curvature of the to-be-coated surface 30 a.
  • a gap d 3 between the nozzle surface 12 and the to-be-coated object 30 can be, for example, d 1 or more and less than d 2 .
  • the end portion regions 36 a are regions that are inclined more than the center region 36 b . As a result, an interface between each of the end portion regions 36 a and the center region 36 b is less likely to be noticeable, and the coating quality can be improved. Further, a boundary between each of the end portion regions 36 a and a non-coating region is clear, and the appearance is improved.
  • the curvature of the to-be-coated surface 30 a is illustrated as being larger in the end portion regions 36 a than in the center region 36 b , but the present invention is not limited thereto.
  • the curvature of the end portion regions 36 a may be smaller than the curvature of the center region 36 b , and the curvature may be constant over the entirety of the to-be-coated surface 30 a.
  • FIG. 4 is an explanatory view illustrating an example of discharge drops according to a second embodiment.
  • the size of the discharge drops formed by the coating material discharged from the nozzle surface 12 differs between the end portion regions 36 a respectively located on the end portion 37 a sides and a center region 36 d located between the end portion regions 36 c , of the region 36 serving as the coating region.
  • discharge drops 16 a located in the end portion regions 36 c are larger than discharge drops 16 b located in the center region 36 d.
  • the discharge drops 16 a By forming the discharge drops 16 a to be larger than the discharge drops 16 b in this manner, for example, the contrast of the second coating layer 34 that is to be located on the end portions 37 a is enhanced and the appearance is improved. Thus, the coating quality can be improved.
  • FIGS. 5 A and 5 B are explanatory views comparing discharging techniques for discharging the coating material.
  • the discharge drops 16 a having a size corresponding to the coating material 16 a 1 serving as a discharged liquid discharged from the nozzle surface 12 of the head 10 are located on the to-be-coated surface 30 a .
  • a discharge amount of the coating material 16 a 1 corresponds to the size of the discharge drops 16 a .
  • the head 10 illustrated in FIG. 5 A is preferably prepared separately from the head 10 that discharges, for example, the discharge drops 16 b .
  • the coating device 1 according to the embodiment can include a plurality of the heads 10 in which the sizes of the discharge drops 16 are different.
  • the example illustrated in FIG. 5 B differs from the example illustrated in FIG. 5 A in that the size of a coating material 16 a 2 discharged from the nozzle surface 12 of the head 10 is smaller than the discharge drops 16 a .
  • the discharge drops 16 a larger than the coating material 16 a 2 can be located on the to-be-coated surface 30 a .
  • the discharge controller 42 controls the discharge gap from the nozzle surface 12 , so that the amount of the coating material 16 a 2 serving as the discharged liquid discharged from the head 10 per unit surface area of the to-be-coated surface 30 a can be changed.
  • the end portion regions 36 c and the center region 36 d can be coated with one type of head 10 .
  • the end portion regions 36 c are regions that are inclined more than the center region 36 d . As a result, an interface between each of the end portion regions 36 c and the center region 36 d is less likely to be noticeable, and the coating quality can be improved. Further, a boundary between each of the end portion regions 36 c and a non-coating region is clear, and the appearance is improved.
  • FIG. 6 is an explanatory view illustrating an example of discharge drops according to a third embodiment.
  • the discharge density of the coating material discharged from the nozzle surface 12 is different between end portion regions 36 e respectively located on the end portion 37 a sides and a center region 36 f located between the end portion regions 36 e , of the region 36 serving as the coating region.
  • the discharge density of the discharge drops 16 located in the end portion regions 36 e is larger than the discharge density of the discharge drops 16 located in the center region 36 f.
  • the contrast of the second coating layer 34 that is to be located on the end portions 37 a is enhanced, and the appearance is improved.
  • the coating quality can be improved.
  • the end portion regions 36 e are regions that are inclined more than the center region 36 f . As a result, an interface between each of the end portion regions 36 e and the center region 36 f is less likely to be noticeable, and the coating quality can be improved. Further, a boundary between each of the end portion regions 36 e and a non-coating region is clear, and the appearance is improved.
  • the coating device 1 moves the head 10 in the Y-axis direction serving as the first direction, subsequently displaces the head 10 in the X-axis direction in accordance with the dimension of the nozzle surface 12 in the X-axis direction, and moves the head 10 in the Y-axis direction again. This point will be described with reference to FIG. 7 .
  • FIG. 7 is a partial enlarged view of FIG. 6 .
  • a region 80 illustrated in FIG. 7 corresponds to an enlarged view of the region 80 in the center region 36 f illustrated in FIG. 6 .
  • discharge drops 16 discharged in the region 80 on the to-be-coated surface 30 a by the head 10 located at a position 10 - a in the X-axis direction moving in the Y-axis direction are schematically illustrated as discharge drops 16 -A
  • discharge drops 16 discharged in the region 80 on the to-be-coated surface 30 a from the head 10 located at a position 10 - b are schematically illustrated as discharge drops 16 -B.
  • discharge holes 11 located at an end portion on the X-axis positive direction side of the head 10 located at the position 10 -A, and discharge holes 11 located at an end portion on the X-axis negative direction side of the head 10 located at the position 10 -B overlap in plan view.
  • the discharge of the coating material from the nozzle surface 12 is controlled so that the discharge density in the portion 81 serving as the overlapping portion of the discharge holes 11 is smaller than the discharge density in a portion other than the portion 81 . Accordingly, for example, the occurrence of coating unevenness in the portion 81 is reduced, and thus the coating quality can be improved.
  • the discharge densities of the discharge drops 16 -A and the discharge drops 16 -B in the portion 81 are reduced to the same degree. but, the present invention is not limited thereto, and the discharge densities of the discharge drops 16 -A and the discharge drops 16 -B may be different from each other.
  • the discharge density in the portion 81 in each of the heads 10 may be less than the discharge density in the portion other than the portion 81 , and for example, it is acceptable for the discharge density in the portion 81 to be 60% of the discharge density in the portion other than the portion 81 (in other words, the discharge density in the portion 81 is 120%).
  • FIG. 8 is an explanatory view illustrating an example of discharge drops according to a fourth embodiment.
  • the fourth embodiment is similar to the third embodiment in that the size of the discharge drops formed by the coating material discharged from the nozzle surface 12 is different between end portion regions 36 g respectively located on end portion 37 a sides and a center region 36 h located between the end portion regions 36 g , of the region 36 serving as the coating region.
  • discharge drops 16 a located in the end portion regions 36 g are smaller than discharge drops 16 b located in the center region 36 h.
  • the discharge drops 16 a By making the discharge drops 16 a smaller than the discharge drops 16 b in this manner, for example, the discharge drops 16 b located on the end portions 37 a having a curvature larger than the curvature of the center region 36 h are less likely to drip, and the coating quality can be improved. Further, a boundary between each of the end portion regions 36 g and a non-coating region is clear, and the appearance is improved.
  • the end portion regions 36 g are regions that are inclined more than the center region 36 h . As a result, an interface between each of the end portion regions 36 g and the center region 36 h is less likely to be noticeable, and the coating quality can be improved. Further, a boundary between each of the end portion regions 36 g and a non-coating region is clear, and the appearance is improved.
  • FIG. 9 is a cross-sectional view illustrating an example of a coated body according to the embodiment.
  • the second coating layer 34 serving as a coating film includes a thick film portion 34 a extending in the Y-axis direction serving as the first direction along the end portions 37 a in end portion regions 36 j respectively located on the end portion 37 a sides, of the region 36 serving as the coating region.
  • a thickness d 11 of the thick film portion 34 a is larger than a thickness d 12 of the second coating layer 34 in a center region 36 k located between the end portion regions 36 j .
  • the contrast of the end portion 37 of the second coating layer 34 is enhanced and the appearance is improved.
  • the coating quality can be improved.
  • the second coating layer 34 includes a recessed portion 34 c adjacent to the thick film portion 34 a along the Y-axis direction.
  • the recessed portion 34 c refers to an inflection point at which the thick film portion 34 a and the center region 36 k intersect with each other in a cross-sectional view, and need not have a thickness smaller than the thickness d 12 of the second coating layer 34 .
  • the thickness d 11 can be, for example, approximately from 7 ⁇ m to 70 ⁇ m.
  • the thickness d 12 can be, for example, from approximately 5 ⁇ m to approximately 50 ⁇ m.
  • the second coating layer 34 includes a plurality of convex portions 34 b located along the Y-axis direction in the center region 36 k serving as the center portion of the coating region.
  • the thickness d 12 of the second coating layer 34 in the convex portion 34 b is smaller than the thickness d 11 of the thick film portion 34 a , for example, the occurrence of the coating unevenness in the convex portion 34 b is reduced, and thus the coating quality can be improved.
  • the thickness d 12 of the second coating layer 34 in the convex portion 34 b is larger than the thickness d 11 of the thick film portion 34 a , for example, the contrast of the end portion 37 is enhanced and the appearance is improved.
  • the coating quality can be improved.
  • color unevenness originating from the protrusion 34 b is less likely to be noticeable, and the coating quality is further improved.
  • the to-be-coated object 30 is described as having the arch shaped curved surface, but the present invention is not limited thereto, and may have, for example, a dome-shaped curved surface. Further, the to-be-coated surface 30 a of the to-be-coated object 30 may be a flat surface or may be produced by a drawing process.
  • FIG. 10 is an explanatory view illustrating an arrangement of a head according to a variation of the first embodiment.
  • the to-be-coated surface 30 a is the flat surface, which is different from the to-be-coated surface 30 a coated by the coating device 1 according to the first embodiment.
  • the head 10 faces the to-be-coated surface 30 a in an inclined posture so that a gap d 21 between the nozzle surface 12 located on the end portion region 37 a sides and the to-be-coated object 30 is smaller than a gap d 22 between the nozzle surface 12 located on the center side of the region 36 and the to-be-coated object 30 .
  • a distance between the nozzle surface 12 and the end portion 37 a is reduced.
  • a boundary of the second coating layer 34 that is to be located on the end portion 37 a is sharp, and the appearance is improved.
  • the coating quality can be improved.
  • the gap d 21 can be, for example, approximately from 0.5 to 20 mm.
  • the gap d 22 can be, for example, approximately from 2 to 30 mm.
  • a gap d 23 between the nozzle surface 12 and the to-be-coated object 30 can be, for example, d 21 or more and less than d 22 .
  • the thickness of the second coating layer 34 is easily stabilized, and the coating quality can be improved.
  • the gap 24 between a center 14 of the head 10 and the to-be-coated surface 30 a is always constant over the entire region 36 .
  • the thickness of the second coating layer 34 is further easily stabilized, and the coating quality can be improved.
  • the coating device 1 including the head 10 configured to discharge a single color coating material was described.
  • robots 20 respectively holding heads 10 for discharging coating materials of basic colors such as magenta (M), yellow (Y), cyan (C), and black (K) may be included.
  • coating is performed on the to-be-coated surface 30 a from the Z-axis positive direction side, but the present invention is not limited thereto, and for example, coating may be performed from the Z-axis negative direction side, and a side surface located along a YZ plane or a ZX plane may serve as the to-be-coated surface 30 a . Further, the coating device 1 may be applied in a case where the to-be-coated surface 30 a located obliquely with respect to the Z axis is coated.
  • first to fourth embodiments may also be combined.
  • the lengths L 1 to L 4 may be the same as or different from each other.
  • the coating device 1 coats the to-be-coated object 30 having the convex curved surface.
  • the coating device 1 includes the head 10 , the arm 21 , and the controller 41 .
  • the head 10 includes the nozzle surface 12 .
  • the arm 21 holds the head 10 .
  • the controller 41 controls the movement of the head 10 via the arm 21 .
  • the controller 41 moves the head 10 in the first direction along the end portions 37 a of the coating region in the state where the head 10 is located so that the gap d 1 between the nozzle surface 12 located on the end portion 37 a sides of the coating region of the to-be-coated object 30 and the to-be-coated object 30 is smaller than the gap d 2 between the nozzle surface 12 located on the center side of the coating region and the to-be-coated object 30 .
  • the coating quality can be improved.
  • the coating device 1 coats the to-be-coated object 30 having the convex curved surface.
  • the coating device 1 includes the head 10 , the arm 21 , and the controller 41 .
  • the head 10 includes the nozzle surface 12 .
  • the arm 21 holds the head 10 .
  • the controller 41 controls the movement of the head 10 via the arm 21 .
  • the head 10 discharges the coating material as discharge drops of different sizes between the end portions of the coating region and the center portion of the coating region. Thus, the coating quality can be improved.
  • the coating device 1 coats the to-be-coated object 30 having the convex curved surface.
  • the coating device 1 includes the head 10 and the controller 41 .
  • the head 10 includes the nozzle surface 12 .
  • the controller 41 controls the discharge of the coating material from the nozzle surface 12 .
  • the discharge density of the coating material in the end portion of the coating region of the to-be-coated object 30 is larger than the discharge density in the center portion of the coating region. Thus, the coating quality can be improved.
  • the coating film according to the embodiments includes the thick film portion 34 a extending in the first direction along the end portion of the coating region of the to-be-coated object 30 .
  • the coating quality can be improved.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Robotics (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Spray Control Apparatus (AREA)
US17/638,855 2019-08-30 2020-07-31 Coating device, coating film, and coating method Abandoned US20220379337A1 (en)

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JP2024036337A (ja) 2024-03-15
CN114340802B (zh) 2023-09-29
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JPWO2021039292A1 (de) 2021-03-04
US20240109096A1 (en) 2024-04-04
CN114340802A (zh) 2022-04-12
EP4023343A1 (de) 2022-07-06

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